prepare the spaghetti by boiling it until it's tender, then dry and keep it aside to cool

preheat olive oil + saute onion and garlic in a pot

wash tomatoes, cut the upper part off then drop them with the onion and garlic

while the tomatoes heat up, press them hard to release their juices, and keep on sauteing

add the tomatoe paste and keep on stirring until it dissolves

add preheated hot water and stir

while it boils, add the salt, pepper and basil

heat it for a minute, then use the net thingy to separate the sauce from the remainings of the tomatoes, while dropping the sauce into the cooked spaghetti